"Good" depends on the objective you're trying to accomplish. Most match stages are too labyrinthine for a two-player match -- most of the time they'll just get lost trying to find each other. Simple battlegrounds mean it's easy to keep track of the other player's location and keep the fight flowing. As far as actual stage design goes, it's pretty well-rounded; there's a lot of open space, but there's high ground, low ground, cover, etc. The imbalances it does have can be easily improved upon with some minor stage tweaks.